49
e
f
g
h
In the case of
Shimano Dual Control
(e)
brake le-
ver/shifter units you shift to the larger chainwheels or
sprockets by moving the entire brake lever inwards.
You can shift up to two chainwheels or three sprock-
ets per gear shift. By moving inward only the small
lever located behind the brake lever, the chain moves
on the smaller chainwheels or sprockets. You can
shift only one chainwheel/sprocket per stroke.
The
Di2
is the electronic version of the high-quality
drive systems from
Shimano
. Instead of cables the
signal is transmitted by wires. The rear and the front
derailleurs are moved by small electrical motors. The
power supply is provided by a rechargeable battery
that is mounted in the seat post
(f)
.
The shifters are positioned and actuated like the
mechanical gears:
With a Di2 you must only press control buttons, in-
stead of pressing the entire brake lever or the lever
positioned behind inward as is the case with usual
dual control shifters from Shimano. Shift to the larger
sprockets by pressing the long control button on the
side of the brake lever. When you press the triangular
control button that is behind the brake lever the chain
moves onto the smaller cogwheels.
SRAM Force
brake levers/shifters
(g)
have only one
shifter that is located behind the brake lever. With
one complete sweep of the shifter, the rear derail-
leur shifts in a higher gear by one to two chainwheels
or three sprockets. With a short sweep the chain
changes to the next smaller chainwheel or sprocket.
In the case of flatbar shifters
(h)
the shifters are loca-
ted underneath the handlebars. The right-hand, big
shifter is actuated with the thumb. The chain moves
on larger sprockets, i.e. to lower gears. The smaller
shifter is actuated either with the index finger or with
the thumb and shifts into the other direction. By ac-
tuating the big shifter with the thumb on the left side
you shift to the larger chainwheel, i.e. to a higher gear
ratio.
G
Always wear straight-cut trousers or
use trouser clips or the like to make sure
your trousers do not get caught in the
chain or the chainwheels. Risk of an accident!
G
Shifting gears under load, i.e. while ped-
aling hard, can make the chain slip. At
the front derailleur the chain may even
slip off the chainwheels and result in an acci-
dent! At the very least the service life of the chain
would be reduced considerably.
Summary of Contents for ROAD BIKE ISO 4210-2
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